Views: 6 Author: Site Editor Publish Time: 2022-11-18 Origin: Site
1.General Info
A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure. The word is derived from the Latin Valves, the moving part of a door, in turn from volvere, to turn, roll.
The simplest, and very ancient, valve is simply a freely hinged flap which swings down to obstruct fluid (gas or liquid) flow in one direction, but is pushed up by the flow itself when the flow is moving in the opposite direction. This is called a check valve, as it prevents or "checks" the flow in one direction. Modern control Valves may regulate pressure or flow downstream and operate on sophisticated automation systems.
2. Valve Materials
The substance or medium flowing through a Valves will often determine the type of valve material. Some Valves materials are best suited for high temperature. Other materials are best suited for their corrosion resistance to fluid substances. In addition, some valve materials are selected when low cost is a factor.
3. Production Process
The production process of industrial Valves involves the manufacturing of the Valves bodies, stem, and seat. The casting method is used to produce these parts of the valve. Some manufacturers also use a forged method that involves cutting and forging, trimming, sandblasting, machining, and surface treatment. The Valves bodies can be made of a single piece or are cast using molds or cores. Modern casting processes use a core to produce parts with complex inner cavities.
4. Assembly
In the manufacturing process, it is essential to follow proper procedures for Valves assembly. The major components of the industrial Valves should be cleaned and assembled separately. After completing the production, the parts need to be assembled to create a complete Valves. The process of the Valves assembly is generally carried out with the body of the Valves serving as a reference part.
5. Pressure Test
After assembly, the valves have to go through a pressure test. The most basic pressure test for industrial Valves is the hydrostatic pressure test. The test involves partially opening the Valves and applying a hydrostatic pressure that is 50 percent higher than its rated working pressure. The Valves’s sealing surface must remain leak-free, and the applied pressure cannot drop below its rated working pressure.
6. Inspection and Quality Control
The last step in industrial Valves manufacturing is inspection and quality control. All the valves need to be inspected to make sure there is no leakage or error. Industrial Valves manufacturers should take inspection and quality control seriously. A QA is appointed to inspect the quality of the end product.